Louis eicke



(No Model.)

ng.21,n1883.

. INvENToR m 11mm Y a P K I f/U j No. 282x473.`

ATTORNEY u. PETCRS. mmumgnnlu. wnhmglm llc.

i UNITED STATES Louis EIKE, or

SPECIFICATION forming; part of Letters To all whom it may concern,.-

Be it known that I, LoUIs ETCEE, of the city, county, and State of New York, have invent ed certain new andv useful Improvements in Drill-Stocks, of which the following` is a specitication. K

Pianoanakers and other wood-workers who have to drill a large numberof holes ln veherctofore employed drill-stocks in which a spirally-grooved ivory pulley is secured to fixed pins of a revolving spindle and retained by heads that are secured to the spindle. The fasteningpins were applied to interior grooves of the' ivory pulley, which caused the pulley to get loose on the spindle by the strains exerted thereon in drilling bythe cord of a hand-bow. VThe pulley was thereby liable to era-ck, and

had then to be replaced, which was connected y with considerable expense.

The objectof this invention is to improve the drillstoeks for pianonnakers in such a m an ner that the disadvantages referred to are dispensed with, and that amore durable and effective tool is obtained; and the invention consists of a spindle, to the screw-threaded portion of which an ivory pulley is secured and then rmly held between a iixed and a detachable head, the latter being applied to a screw-thread on the spindle, cut in opposite direction to that 3o of thepulley. f

In the accompanying drawings, Figures l and 2 represent a side elevation and a vertical central section of my improved drill-stock. for piano-inal ers; and Fig. 3 is a vertical central section, showing the construction ofthe drillstocks heretofore in use.

Similar letters of reference indi cate corresponding parts.

A in the dn wings represents the spindle of 4o a drill-stock for piano-makers or other woodworkers; B, the hollow handle of the same, which is provided at its interior with a neck and stepbearing for the spindle A, as shown in Fig. 2. The handleB is made of three partsy au end or butt portion that is screwed over the threaded shank ofthe middle part, which latter is again screwed over the threaded portion or retaining-nut which forms the opposite terminal of the handle. The spindle A is first The DRILL- PATENT OFFICE.

NEW YORK, n. Y.

STOCK.

Patent No. 283,473, dated August 21,l 1883.

Application filed Marcl1`21p183. (No model.)

middle part of the handle is then screwed 011-, to the nut part and the step -bearing at the end 5 5 of the middle portion applied to the end of the spindle. The outer or butt end of the handle is then screwed over the middle part. The construction of the handle as thus far described has been used heretofore, and I do not claim 6o the same.

To the outer socket end of the spindle A is applied a drilling-tool in the usual manner.

A spirallygro oved ivory pulley, C, is screwed by an interior screw-thread, a, onto a correspondingly-threaded portion, a, of the spindle A and retained rigidly in position thereon by disk-shaped heads D D', of which the lower one is driven rigidly onto a shoulder of the spindle A, while the upper head, D', is screwed 7o thereto by means of a screw-thread, d, that is cut in opposite direction to the screw-thread a of the pulley C. The ivory-pulley C and the head D' are placed in position by being slipped over the longer end of the spindle above the fixed head D and before the spindle is inserted l into the handle, as before described. l The ivory pulley is thereby firmly applied to the spindle A, held tightly betw een the headsv spindle by the action ofthe drivin g-cord, so that nol internalstrains are exerted in the pulley by which it will be liable to crack orbe otherwise injured. rlhe drill-stock will consequently be more durable and adapted in a high de-r 8 5 'gi-ee to resist the ,wear to which it is exposed by the concussions and strains exerted thereon in working the same.

Having thus described my invention, I claim as new and desire to secure by Letters Patent? 9o As an improvement in drill-stocks for piano makers, the combination ofthe spindle A, having a fixed head, D, and screw-threaded por, tion a, with a spirally-grooved ivory pulley, C, screwed on the threaded portion a and secured 9 5 by a second head, D', that is screwed onto a threaded portion, d, of the spindle, cut in opposite direction to the thread a, substantially as and for the purpose specified.

my invention l have signed my name in presence of two subscribing witnesses.

LOUIS EICKE.

Nitnessesz PAUL GoErEL, SIDNEY Manly.

D D', and thus prevented from shifting on the 8o' III testimony that I claim the foregoing as roo 

